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dc.contributor.author
Kubeneck, Luisa Joëlle
dc.contributor.author
Thomas Arrigo, Laurel K.
dc.contributor.author
Rothwell, Katherine A.
dc.contributor.author
Kretzschmar, Ruben
dc.date.accessioned
2020-12-18T09:26:33Z
dc.date.available
2020-12-18T08:39:39Z
dc.date.available
2020-12-18T09:26:33Z
dc.date.issued
2020-05
dc.identifier.other
10.5194/egusphere-egu2020-20474
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/457056
dc.identifier.doi
10.3929/ethz-b-000457056
dc.description.abstract
Phosphorus (P) is often a limiting nutrient in soils and aquatic systems, but excessive concentrations can lead to eutrophication. The chemical forms in which P is retained in soils and sediments determine its bioavailability. Under reducing conditions, the ferrous phosphate mineral vivianite has been shown to be a major P burial phase in various environments such as coastal sediments. Depending on the local environmental geochemistry, ferrous iron (Fe2+) can be substituted by other divalent cations such as magnesium (Mg2+) and manganese (Mn2+). The substitution of Fe2+ could alter mineralogical characteristics of vivianite, which influences its further reactivity and thus the P and iron (Fe) cycle. Despite the importance of divalent cation substitution in vivianite in the environment, questions remain if certain divalent cations are preferentially incorporated and how they compete for substitution. Here, we assessed the competitive incorporation of Mn2+ and Mg2+ into vivianite by carrying out vivianite precipitation experiments in anoxic aqueous solutions at pH 7. Additionally, we explored how varying salinity simulating an estuarine gradient influences the incorporation of Mn2+ and Mg2+. Changes in mineralogy with different degrees of Mn2+/ Mg2+ substitution were studied with X-ray powder diffraction, Raman spectroscopy, total elemental dissolution and other techniques. Based on 19 different vivianites, our results demonstrate that Fe2+ is replaced by up to 50% by Mn2+/ Mg2+ in the vivianite structure, with preferential incorporation of Mn2+ over Mg2+. Increases in salinity seem to slightly enhance divalent cation incorporation. Following from our results, we will discuss the factors influencing divalent cation incorporation into vivianite, and how divalent cation substitution alters mineralogical characteristics. Finally, we will highlight how the substitution of Fe2+ by other divalent cations potentially enhances P fixation in form of vivianite under Fe-limiting conditions.
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Copernicus
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.title
Competitive divalent cation incorporation in the ferrous phosphate mineral vivianite
en_US
dc.type
Other Conference Item
dc.rights.license
Creative Commons Attribution 4.0 International
ethz.journal.title
EGUsphere
ethz.pages.start
EGU2020-20474
en_US
ethz.size
1 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.event
EGU General Assembly 2020
en_US
ethz.event.location
Online
en_US
ethz.event.date
May 4-8, 2020
en_US
ethz.notes
Conference lecture held on May 5, 2020. Conference should have been held in Vienna, Austria. Due to the Corona virus (COVID-19) the conference was conducted virtually.
en_US
ethz.publication.place
Göttingen
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02721 - Inst. f. Biogeochemie u. Schadstoffdyn. / Inst. Biogeochem. and Pollutant Dynamics::03541 - Kretzschmar, Ruben / Kretzschmar, Ruben
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02721 - Inst. f. Biogeochemie u. Schadstoffdyn. / Inst. Biogeochem. and Pollutant Dynamics::03541 - Kretzschmar, Ruben / Kretzschmar, Ruben
en_US
ethz.date.deposited
2020-12-18T08:39:52Z
ethz.source
FORM
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2020-12-18T09:27:11Z
ethz.rosetta.lastUpdated
2022-03-29T04:36:48Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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